On This Page
This set of Heat Engines Multiple Choice Questions & Answers (MCQs) focuses on Heat Engines Set 18
Q1 | How many kg of air will contain one kg of oxygen?
- 6.65 kg
- 10 kg
- 4.35 kg
- 12.5 kg
- 1 kg
Q2 | Vapour lock is
- Seizure of supply of fuel in a diesel engine
- Serious restriction to the supply of fuel due to excessively rapid formation of vapour in S.I. engine
- Locking of carbourettor jets due to vapour formation
- Locking of jets due to impurities in petrol
- None of the above
Q3 | Which of the following part is not common between a steam engine and a petrol engine?
- Crankshaft
- Connecting road
- Piston rings
- Muffler
- Piston
Q4 | The efficiency of a jet engine is higher at
- Higher altitudes
- Lower altitudes
- High speeds
- High speeds and low altitudes
- Low speeds
Q5 | Which of the following is a false stagement: The cause of excessive engine vibrations especially at high speeds in spark ignition engines is
- Unequal distribution of mixture
- Unbalanced crankshaft
- Unequal compression of engine cylinders
- Ignition distributor point not synchrohized
- Unbalanced fan or loose fan blade
Q6 | In regenerative feed heating system the steam 'bled' from turbine exchanges heat with
- High pressure steam coming from boiler
- Air for preheating
- Fuel for preheating
- Feed water for boiler
- All of the above
Q7 | In thermodynamics spontaneous processes are those
- Where a difference is observed in any microscopic property of the system between different times or states
- Where a difference is observed in any microscopic property of the system between different times or states
- Which occur in the direction of an intensive property or driving force contained within the system
- Which require an agency outside the system to force the process
- None of the above
Q8 | Which one of the following is not a constituent of coal
- Carbon
- Manganese
- Inorganic matter
- Hydrogen
- Nitrogen
Q9 | The gas used for cooling the conductors of large generators is
- Nitrogen
- Air
- Oxygen
- Carbon dioxide
- Hydrogen
Q10 | During preliminary test run of an engine for 7 hours cycles if the engine stops after operating for 5 hours then
- The engine is rejected
- The engine is again run for 7 hours
- The engine in run for balance 2 hours
- The engine is removed and another piece tested
- None of the above
Q11 | Prony brake is used for testing of
- Slow speed engines
- Large engines
- Small engines
- High speed engines
- Engines having small flywheel
Q12 | The missing quantity in a steam engine can be reduced by all of the following methods EXCEPT
- Superheating the steam supplied to the engine
- Steam jacketing of cylinder walls
- Reducing the speed of the engine
- Dompounding the expansion of steam in two or more cylinders
- 85% octane + 15% heptane
Q13 | In the Bomb calorimeter the fuel to be tested is burned
- There is no consideration of pressure, volume or temperature.
- At constant temperature
- At constant volume
- In open atmosphere
- At constant pressure
Q14 | The maximum horse power of a 150 CC scooter engine is around
- 3
- 1.5
- 15
- 8
- 33
Q15 | Boilers using Bagasse as fuel use
- Travelling grate stroker
- Underfeed stokers
- Pulverized fuel burners
- Chain grate stokers
- Spreader stokers
Q16 | The enthalpy of vaporisation is minimum at
- 100?C
- Critical temperature
- 0?C
- 25 to 30
- Absolute zero
Q17 | Which part of a gas turbine is subjected to the highest temperature?
- Blades
- Regenerator
- Intercooler
- Compressor coupling
- Compressed air
Q18 | In case of glass tube type water level indicator for a boiler
- One end of the tube is connected to water space and the other is connected to steam space in the drum
- Both ends of the tube are connected to water space
- One end of the tube is connected to water space and the other end connected to chimney
- One end of the tube is connected to water space and the other end is connected to superheated steam outlet from superheater
- One end of the tube is connected to water space and the other is open to atmosphere
Q19 | Baffles are provided on engines to
- Improve engine performance
- Improve heat transfers rate
- Guard against dirt and dust
- Assist in starting the engine
- Reduce fuel consumption
Q20 | A rope brake dynamometer falls under the category of
- Transmission type dynamometer
- Hydraulic dynamometer
- Mechanical friction type dynamometer
- Electrical type dynamometer
- Torsion type dynamometer
Q21 | Live storage of fuel means
- Fuel stored to meet day's requirement for the boiler
- Fuel stored for supply at any time during emergency
- Fuel stored at the plant
- Fuel stored near the burners
- None of the above
Q22 | In closed cooling system
- Hot water is recirculated after cooling
- Constant fresh water for cooling is supplied
- Water surrounding the cylinder is allowed to evaporate
- Air and water cooling is simultaneously used
- Water does not flow
Q23 | In a four stroke petrol engine
- Intake valve closes before TDC
- Intake valve closes after BDC
- Exhaust valve closes before BDC
- Exhaust valve open before BDC
- None of the above
Q24 | Coking is
- In boiler furnace some coal becomes plastic and forms lumps or masses of coke
- Making cakes of coal out of fine powders
- Coal produced from burning of wood in inert atmosphere
- Free burning coals are known as coking coals
- None of the above
Q25 | Shock effect in the nozzle generally occurs in
- Inlet
- Converging section
- Throat
- Diverging section
- Exit